114 GIGARTINACEAE 
(Fl. Boliv. 30. 1839). We have seen no further suggestion of 
the occurrence of Ahnfeltia plicata (Huds.) Fr. in Peru, but this 
species has been credited to the Magellan Straits region by Hariot 
(Miss. Sci. Cap Horn 5: 71. 1889) and by others, and closely 
related, if not identical species [Ahnfeltia setacea (Kiitz.) Schmitz 
and A. elongata Mont.], occur on the Chilean coasts. 
ACTINOCOCCUS Kiitz. Phyc. Gen. 177. 1843. Schmitz, 
Flora 77: 367-418. 1893. Darbishire, Ann. Bot. 13: 
253-267. 1899. Heydrich, Ber. Deuts. Bot. 
Ges. 24: 71-77. 1906 
Actinococcus mollis sp. nov. 
Cushions hemispheric, subglobose, or irregularly verrucaeform, 
0.5-2.0 mm. in diameter (0.45-1.3 mm. high), solitary, gregarious, 
or occasionally and sparingly рени mostly marginal, often 
on one surface only but sometimes growing through and antipodal- 
dicephalous, soft and gelatinous, wrinkled and collabent on drying, 
sessile, affixed by a base 1-3 as broad; cortical filaments 200- 
500 и long, scarcely tapering at apex, their cells (protoplasts*) - 
8-22 и X 4-би; medullary and rhizoidal cells mostly 5-28 и X 4- 
II и; sporangia four-parted, 16-22 и X 7-13 и. 
On Gymnogongrus disciplinalis (Bory) J. Ag., Апсбп, Feb. 13, 
1907, Coker 95 p.p. (type—PLATE 43), and La Punta, region of 
Callao, Jan. 25, 1907, Coker 38 p.p.; also on some of the original 
specimens of G. disciplinalis (from Cape Horn, Concepcion, etc.) 
in herb. Bory, now preserved in the Muséum d'Histoire Naturelle 
of Paris. The Actinococcus оп“ Gymnogongrus vermicularis (2) " 
from Callao, alluded to by Schmitz (Flora 77: 389. 1893), prob- 
ably belongs here. 
In size and general habit, Actinococcus mollis resembles A. sub- 
cutaneus on Phyllophora species fully as much as it does any of the 
three species described by Schmitz as parasitic on species of 
Gymnogongrus, but it differs from A. subcutaneus very decidedly in 
its softer, more gelatinous, collabent, less pedicelled, and less 
globose cushions, in its much smaller medullary cells (often 60-140 
и X 30-70 џ іп А. subcutaneus), its more elongate cells of the 
cortical filaments, etc. 
* The cell walls are so gelatinous and confluent that it is very difficult to define 
their boundaries even after staining. The measurements of cells and sporangia as 
here given relate to their protoplasmic contents. 
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